I'm running Communigate Pro 5.3.15 and have received a request to disable
basic authentication for the webmail and webadmin HTTP interfaces --
basically, I want to disable passing logon names and passwords in cleartext
using a web browser.

I don't have an SSL certificate for webmail, so what I would like to do is
somehow force Communigate to always raise the Windows Authentication (NTLM)
box. But I can't seem to find a setting to disable basic authentication for
HTTPA / HTTPU.

I know Communigate can do this -- when I click the "auto-login" button, I
get the NTLM prompt and can enter credentials and login that way. What I
need to do is always force this mode.

Under Settings -> Services -> HTTPA, there are some "Advertise" options:

X Advertise 'Basic' Authentication

Advertise 'NTLM' Authentication

Advertise 'Digest' Authentication

Advertise 'Negotiate' Authentication

But my understanding is that selecting these doesn't affect the services
that are actually available.

I tried to use the SSL/TLS listner port, and that doesn't work at all -- the
browser just hangs.

So, I would like to disable basic authentication for the web user and web
admin interfaces so the browser pops up the NTLM box. Can someone direct me
to the setting?